Twyer-stock cap.



No. 891,151. PATENTED 111111116, 1908. R. B. DOUD.

TWYER STOCK GAP.

APPLICATION I'iLED AUG. 31.1904.

RALPH B. DOUD, OF SHEFFIELD, ALABAMA.

'rwYEn-s'rocK CAP.

Specification of Letters Patent.

Patented June 16, 1908.

twyer stock. At the opposite end of the Application filed August 31,1904. Serial No. 222,855.

To all whom "it may concern: Be it known that I, RALPH B. DoUD, a l

citizen of the United States, residing at Shefiield, in 'the county ofColbert and the State of Alabama, have invented a new and usefulImprovement in Twyer-Stock Caps,of which the following is aspecification.

Thisuinvention relates to a cap designed to close the 0 eningin thetwyer stock, and adapted to e -quickly and conveniently o ened in orderthat the blow pipe may be c eaned out. 1

The object of the invention is a cap which can be opened withoutrequiring the use of a wrench, or the removal of pins or nuts, which areliable to become lost in the dirt and slag surrounding the vicinity of ablast furnace.'

The invention consists also of the novel features of construction andcombination of parts hereinafter described, pointed out in the claimsand shown in the accompanying drawings, in which, Figure 1 is a verticalelevation showinga face view of my twyer cap, Fig. 2 is a verticalsection through the lower portion of the twyer stock, and Fig, 3 is ahorizontal section taken through the twyer stock above the ca In thedrawings A represents a twyer stock having a blow pipe opening A andalinin with the same an opening A which is close by the twyer ca B. Thecap B has a central boss .or outwar 1 extending thickened portion B inwhich 1s formed the snufiin opening B. This opening B is closed y theusual form of latch C provided with the eep hole C covered by a tintedglass C and eld' in place by the cap C The latch C is pivoted to thebossB and engages a keeper C also carried by the boss.

To support the cap B I em loy a frame D which incloses-the sides of t eboss and is secured to the same by the screws D. At one end the framehas a rearwardly extending threaded portion, as shown at E.

Ihave shown the rod E swung outwardly arm D pivoted between lugs Fcarried by the frame is a forwardly extending arm 1) bifurcated at itsouter end. by a pivot pin F between. lugs F and is adapted to swing inand out of the bifurcated portion of the arm D The outer portion of therod E is threaded and a hand wheel having a threaded bore works on thisIn Fig.1

or into a'position to unlock the twyer cap and permlt the same to beopened. To lock the cap the rod is swung into the position shown in fulland dotted lines in Fig. 3 and the hand wheel screwed down. This twyercap can be used with any form of twyer stock, the arm D being shaped tocooperate with the lugs, or, in 1 ase the latter are missing, a platehaving suitable lugs thereon can be olted or riveted to the twyer stockin the pro er position relative to the opening-A". avin thusfullydescribed my invention what I ci aim as new anddesire to secure byLetters Patent is:

The combination with a twyer stock having a suitable o ening, a twyercap having a central boss SLIM an opening formed through the boss, alatch carried by the boss and having a peep hole formed therein, a frameinclosing the boss, screws working through 01posit'e sides of the frameand engaging t 0 boss, an arm extending from one end of the frame, saidarm being pivotally connected to the twyer stock, the bifurcated armextending from the opposite end of the frame, a rod pivotally mountedadjacent the said end of the frame and adapted to swing into and outofengagement with the bifurcation, the outer end portion of the said rodbeing threaded, and a locking wheel working upon the threaded portion ofthe rod.

RALPH B. DOU D.

Witnesses:

J. B. SPRUANOE, B. Downs.

A rod E is secured

